小独山西钨金矿区宏微观构造及EBSD分析

Macro-microscopic Structure and EBSD Analysis in the western tungsten-gold mining area of Xiaodushan

小独山西钨金矿床是甘肃省北山地区新发现的一大型钨矿床,矿区韧性剪切带沿EW走向,整体向南倾斜。本文运用电子背散射衍射技术(EBSD)方法,对矿区糜棱岩进行了组构分析,其结果显示:糜棱岩韧性变形强烈,主要受中温-高温影响。结合前人研究成果,推测矿区中生代以来至少经历了三个期次的构造变形运动。

As a large tungsten deposit newly discovered in Beishan area of Gansu Province,the ductile shear zone in the west of Xiaodu hill is inclined to the south along the EW direction.By using electron backscatter diffraction (EBSD) method,the structural analysis of mylonite in mining area is carried out.The results show that the ductile deformation of mylonite is strong,which is mainly affected by medium temperature and high temperature.Combined with the previous research results,it is inferred that there have been at least three tectonic deformation movements since Mesozoic in the mining area.